<?xml version="1.0" encoding="ISO-8859-1"?><article xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
<front>
<journal-meta>
<journal-id>0188-4999</journal-id>
<journal-title><![CDATA[Revista internacional de contaminación ambiental]]></journal-title>
<abbrev-journal-title><![CDATA[Rev. Int. Contam. Ambient]]></abbrev-journal-title>
<issn>0188-4999</issn>
<publisher>
<publisher-name><![CDATA[Universidad Nacional Autónoma de México, Instituto de Ciencias de la Atmósfera y Cambio Climático]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S0188-49992023000100137</article-id>
<article-id pub-id-type="doi">10.20937/rica.54585</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Efecto de la dieta para bovinos a base de Leucaena leucocephala en las emisiones de N2O en parche de orina simulado en un sistema silvopastoril en la época de estiaje]]></article-title>
<article-title xml:lang="en"><![CDATA[Effect of the diet for cattle based on Leucaena leucocephala on the emission of N2O in a simulated urine patch in a silvopastoral system in the dry season]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Osorio-Montor]]></surname>
<given-names><![CDATA[Tania Guadalupe]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Castelán-Ortega]]></surname>
<given-names><![CDATA[Octavio Alonso]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Saynes-Santillán]]></surname>
<given-names><![CDATA[Vinisa]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Salazar-Sperberg]]></surname>
<given-names><![CDATA[Francisco]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Avilés-Nova]]></surname>
<given-names><![CDATA[Francisca]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Universidad Autónoma del Estado de México  ]]></institution>
<addr-line><![CDATA[Temascaltepec de González Estado de México]]></addr-line>
<country>Mexico</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Universidad Autónoma del Estado de México  ]]></institution>
<addr-line><![CDATA[Toluca Estado de México]]></addr-line>
<country>Mexico</country>
</aff>
<aff id="Af3">
<institution><![CDATA[,Colegio de Postgraduados  ]]></institution>
<addr-line><![CDATA[Texcoco Estado de México]]></addr-line>
<country>Mexico</country>
</aff>
<aff id="Af4">
<institution><![CDATA[,Instituto Nacional de Investigación Agrícola  ]]></institution>
<addr-line><![CDATA[Osorno ]]></addr-line>
<country>Chile</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>00</month>
<year>2023</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>00</month>
<year>2023</year>
</pub-date>
<volume>39</volume>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S0188-49992023000100137&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S0188-49992023000100137&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S0188-49992023000100137&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[RESUMEN El N2O tiene un potencial de calentamiento global de 300 veces mayor que el CO2 y en los sistemas silvopastoriles, la orina es una fuente de emisión de N2O. El objetivo de la investigación fue evaluar el efecto de la dieta para bovinos a base de Leucaena leucocephala sobre las emisiones de N2O en parche de orina simulado en un sistema silvopastoril. Se utilizó una pradera de Cynodon plectostachyus y se realizaron 13 muestreos durante marzo - abril de 2021. Los tratamientos fueron A: 20 kg de urea/ha a partir de orina de bovinos alimentados con 100 % heno de C. plectostachyus + 0 % de L. leucocephala, B: 36 kg de urea/ha a partir de orina de bovinos alimentados con 16 % de L. leucocephala + 84 % de C. plectostachyus y C: 79 kg de urea/ha a partir de orina de bovinos alimentados con 33 % de L. leucocephala + 67 % de C. plectostachyus Se utilizó un diseño completamente al azar con cuatro repeticiones. Se utilizaron cámaras de acero inoxidable cerradas estáticas para la obtención de muestras de gases a los 0, 10, 20 y 30 minutos. Se registraron la temperatura ambiental, pH, humedad, contenidos de nitrato y amonio en el suelo. Se analizaron los datos con el programa estadístico SAS 9.0. El flujo de emisión de N2O (&#956;g m2/h) entre tratamientos no presentó diferencias significativas. El pico de emisión se observó en el cuarto día de muestreo en los tratamientos (A: 17.49, B: 23.71 y C: 22.88 &#956;g N2O N m2/h). Además, existió una correlación positiva entre el flujo de N2O y la humedad del suelo. El incremento de la cantidad de L. leucocephala en la dieta de los animales no influyó sobre la emisión de N2O, debido a la concentración de urea en la orina. Sin embargo, se observó una correlación positiva con la humedad del suelo.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[ABSTRACT N2O has a global warming potential of 300 times greater than CO2, and in silvopastoral systems, urine is a source of N2O emission. The objective of the research was to evaluate the effect of the diet for bovines based on Leucaena leucocephala on N2O emissions in a simulated urine patch in a silvopastoral system. A Cynodon plectostachyus meadow was used, and 13 samplings were carried out during March - April 2021. The treatments were, A: 20 kg of urea/ha from bovine urine fed with 100% C. plectostachyus hay + 0% L leucocephala, B: 36 kg of urea/ha from the urine of bovines fed with 16% of L. leucocephala + 84% of C. plectostachyus and C: 79 kg of urea/ha from the urine of bovines fed with 33% L. leucocephala + 67% C. plectostachyus. A completely randomized design with four replicates was used. Static closed stainless-steel chambers were used to obtain gas samples at 0, 10, 20 and 30 minutes. Environmental temperature, pH, humidity, nitrate and ammonium contents in the soil were recorded. Data were analyzed with the statistical program SAS 9.0. The N2O emission flux (&#956;g/m2/h) between treatments did not present significant differences. The emission peak was observed on the fourth day of sampling in the treatments (A: 17.49, B: 23.71 and C: 22.88 &#956;g N2O N m2/h). In addition, there was a positive correlation between the N2O flux and soil moisture. The increase in the amount of L. leucocephala in the diet of the animals did not influence the emission of N2O, due to the concentration of urea in the urine. However, a positive correlation with soil moisture was observed.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[óxido nitroso]]></kwd>
<kwd lng="es"><![CDATA[cambio climático]]></kwd>
<kwd lng="es"><![CDATA[ganadería]]></kwd>
<kwd lng="es"><![CDATA[gas de efecto invernadero]]></kwd>
<kwd lng="en"><![CDATA[nitrous oxide]]></kwd>
<kwd lng="en"><![CDATA[climate change]]></kwd>
<kwd lng="en"><![CDATA[livestock]]></kwd>
<kwd lng="en"><![CDATA[emissions]]></kwd>
</kwd-group>
</article-meta>
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